Every other time they have arrived too late. The first time, the aasimar had been murdered in his home; the blood was not yet cold, but the body was gone, so there was no question of raising him. The second time, they saw the city burning as they flew in and were unsurprised to find their target's home at the center of the firestorm. No body that time either.
The third one had already been taken prisoner by the time they arrived, and they spent six months chasing her frantically halfway across the world. The cultists didn't make it to the gate with her, but they didn't recover her alive either.
Honestly the whole situation is pretty dispiriting and doing terrifying things to their bank accounts, and if they aren't able to rescue this one they are going to need to go back to Sothis and cast spells for pay for a while. Though if this one is in enemy hands they'll hardly have affordance to do that.
This one is being held in a village, in an ordinary-looking house, but the other houses looked ordinary too, or at least the ashes of them did, and one can't be too careful.
A second before the wall collapses, the residents of the house might notice that everything goes silent and they can no longer speak.